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<title>DATABASE: Element-files</title>
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<h3>Element-files</h3>

<p>The role of the element file is to establish correspondences between chemical
elements and metal ions and ligands in the database.</p>

<p>The name of the element file must have extention <nobr>&#147;<tt>elm</tt>&#148;.</nobr></p>

<h5>Format of Element-files:</h5>

<p>Element files are plain text files. Each line must contain:</p>
<ul>
<li>Name of the chemical element</li>
<li>How many chemical components are associated with the element</li>
<li>For each component: its name, and an optional explanation text</li>
</ul>
<p class="cont">The data is separated by either commas <nobr>(,)</nobr> or semicolons <nobr>(;).</nobr></p>
<p>Examples:</p>
<p class="indent">
<nobr><tt>C,1,gly-;glycine (aminoacetate),</tt></nobr><br>
<nobr><tt>Fe,2; Fe&nbsp;2+,, Fe&nbsp;3+,,</tt></nobr>
</p>

<p class="cont">As shown in the second line of this example, the explanation text is optional,
it is given to help the user explaining what the different ligand names mean.</p>

<p><i>Comments:</i> lines starting with a slash <nobr>(/)</nobr> are considered
comments and discarded. Any extra information at the end of a line is also discarded.</p>

<p><a href="DB_Names_Numbers.htm"><b>How to enter names and numbers in b></a></p> 

<p><b>To remove a component</b> from the list of available components for a given element,
preceede the name of the component by a <nobr>&#147;@&#148;.</nobr> For example:</p>
<p class="indent">
<nobr><tt>Fe,1,@Fe&nbsp;2+,,</tt></nobr>
</p>

<p class="cont">This would remove <nobr>&#147;Fe&nbsp;2+&#148;</nobr> from the components
available for iron.

See also <a href="DB_Remove_change_data.htm">Removing or Changing <nobr>data</a>.</nobr></p>

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